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    不锈钢为什么也会生锈

    日期: 2013-06-19 信息来源: admin 浏览次数【278

    不锈钢加工也会生锈?

     当不锈钢管表面出现褐色锈斑(点)的时候,人们大感惊奇:认为 “不锈钢是不生锈的,生锈就不是不锈钢了,可能是钢质出现了问题”。 其实,这是对不锈钢缺乏了解的一种片面的错误看法。不锈钢在一定的 条件下也会生锈的。 


    1.不锈钢表面存积着含有其他金属元素的粉尘或异类金属颗粒的附着物,在潮湿的空气中,附着物与不锈钢间的冷凝水,将二者连成一个 微电池,引发了电化学反应,保护膜受到破坏,称之谓电化学腐蚀。 

    2.不锈钢表面粘附有机物汁液(如瓜菜、面汤、痰等),在有水氧 情况下,构成有机酸,长时间则有机酸对金属表面的腐蚀。 

    3.不锈钢表面粘附含有酸、碱、盐类物质(如装修墙壁的碱水、石 灰水喷溅),引起局部腐蚀。 

    4.在有污染的空气中(如含有大量硫化物、氧化碳、氧化氮的大气 ),遇冷凝水,形成硫酸、硝酸、醋酸液点,引起化学腐蚀。 

    When the surface of stainless steel brown rust (point), people great surprise: that "Stainless steel is not rust, the rust is not stainless steel, steel may be a problem." In fact, this is a lack of understanding of the stainless steel one-sided view of the error. Stainless steel will rust under certain conditions a.


    A stainless steel surface accumulating the dust containing other metals or heterogeneous metal particles attachments, in the humid air, fixtures and stainless steel condensate between the two together into a micro-cell, causing the electrochemical reaction , the protective film is damaged, call it that electrochemical corrosion.

    2 stainless steel surface adhesion of organic juice (such as vegetables, soup, sputum, etc.), in a case of water oxygen to form organic acids, acids long is the corrosion of the metal surface.

    3 stainless steel surface adhesion containing acid, alkali, salts (such as wall decoration alkaline, lime splash), causing localized corrosion.

    4 in the contamination of the air (such as rich in sulfides, carbon dioxide, nitrogen oxide atmosphere), the case of condensation water to form sulfuric acid, nitric acid, acetic acid solution point, cause chemical corrosion.




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